[ARMv8] Add builtins for CRC instructions.
Patch by Bradley Smith!
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190931 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index e6cfe64..4b4c8f4 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -2153,6 +2153,49 @@
return Builder.CreateCall(F);
}
+ // CRC32
+ Intrinsic::ID CRCIntrinsicID = Intrinsic::not_intrinsic;
+ switch (BuiltinID) {
+ case ARM::BI__builtin_arm_crc32b:
+ CRCIntrinsicID = Intrinsic::arm_crc32b; break;
+ case ARM::BI__builtin_arm_crc32cb:
+ CRCIntrinsicID = Intrinsic::arm_crc32cb; break;
+ case ARM::BI__builtin_arm_crc32h:
+ CRCIntrinsicID = Intrinsic::arm_crc32h; break;
+ case ARM::BI__builtin_arm_crc32ch:
+ CRCIntrinsicID = Intrinsic::arm_crc32ch; break;
+ case ARM::BI__builtin_arm_crc32w:
+ case ARM::BI__builtin_arm_crc32d:
+ CRCIntrinsicID = Intrinsic::arm_crc32w; break;
+ case ARM::BI__builtin_arm_crc32cw:
+ case ARM::BI__builtin_arm_crc32cd:
+ CRCIntrinsicID = Intrinsic::arm_crc32cw; break;
+ }
+
+ if (CRCIntrinsicID != Intrinsic::not_intrinsic) {
+ Value *Arg0 = EmitScalarExpr(E->getArg(0));
+ Value *Arg1 = EmitScalarExpr(E->getArg(1));
+
+ // crc32{c,}d intrinsics are implemnted as two calls to crc32{c,}w
+ // intrinsics, hence we need different codegen for these cases.
+ if (BuiltinID == ARM::BI__builtin_arm_crc32d ||
+ BuiltinID == ARM::BI__builtin_arm_crc32cd) {
+ Value *C1 = llvm::ConstantInt::get(Int64Ty, 32);
+ Value *Arg1a = Builder.CreateTruncOrBitCast(Arg1, Int32Ty);
+ Value *Arg1b = Builder.CreateLShr(Arg1, C1);
+ Arg1b = Builder.CreateTruncOrBitCast(Arg1b, Int32Ty);
+
+ Function *F = CGM.getIntrinsic(CRCIntrinsicID);
+ Value *Res = Builder.CreateCall2(F, Arg0, Arg1a);
+ return Builder.CreateCall2(F, Res, Arg1b);
+ } else {
+ Arg1 = Builder.CreateZExtOrBitCast(Arg1, Int32Ty);
+
+ Function *F = CGM.getIntrinsic(CRCIntrinsicID);
+ return Builder.CreateCall2(F, Arg0, Arg1);
+ }
+ }
+
SmallVector<Value*, 4> Ops;
llvm::Value *Align = 0;
for (unsigned i = 0, e = E->getNumArgs() - 1; i != e; i++) {